Ok, so I was making a simple widget that had a little 32x32 png image
that you can pick up and move around. I do this by setting the mouse
cursor to a pixmap cursor of the image when mousePressEvent is
triggered, and reverting back when mouseReleaseEvent is triggered. I
also want to track the mouse with mouseMoveEvent for later
functionality. For the functionality I want, the mouse needs to
continue to be tracked when it leaves the widget/window (and hopefully
keeps the icon). This was easier to get working than I had thought, but
when I started adding functionality and incorporated it into a window I
ran into some strange behavior. If I have my widget in a gridLayout
with a QSpacerItem with a QSizePolicy.Expanding property and also call
winId() for my widget, the tracking/cursor break when the mouse goes out
of the window. The behavior is even different I move the mouse out the
top vs. out the sides and bottom, as the former doesn't even resume
tracking when the mouse comes back onto the window.
The appended code reproduces the behavior (I'm using PyQt4.4.3 and
Python2.5.2, on WindowsXP Pro).
If you comment out the call to self.winId(), than the code works as
expected. Also, if you leave the call to self.winId() but remove the
",QtGui.QSizePolicy.Expanding" from the QSpacerItem constructor the code
works correctly. It seems that having both of them breaks something.
Is this a Bug, or am I just missing something?
from PyQt4 import QtGui, QtCore
import sys
class Drag(QtGui.QLabel):
def __init__(self, parent=None):
QtGui.QLabel.__init__(self, parent)
self.image = QtGui.QPixmap('dead.png')
self.wfc = QtGui.QCursor(self.image)
self.setPixmap(self.image)
self.winId()
def mousePressEvent(self, event):
print 'set'
self.setPixmap(QtGui.QPixmap())
self.setCursor(self.wfc)
event.accept()
def mouseMoveEvent(self, event):
print event.pos()
event.accept()
def mouseReleaseEvent(self, event):
print 'rel'
self.setCursor(QtCore.Qt.ArrowCursor)
self.setPixmap(self.image)
event.accept()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
win = QtGui.QWidget()
lay = QtGui.QGridLayout(win)
dw = Drag(win)
lay.addWidget(dw)
lay.addItem(QtGui.QSpacerItem(13,20,QtGui.QSizePolicy.Expanding), 1, 1)
win.show()
win.resize(200,200)
app.exec_()
from PyQt4 import QtGui, QtCore
import sys
class Drag(QtGui.QLabel):
def __init__(self, parent=None):
QtGui.QLabel.__init__(self, parent)
self.image = QtGui.QPixmap('dead.png')
self.wfc = QtGui.QCursor(self.image)
self.setPixmap(self.image)
self.winId()
def mousePressEvent(self, event):
print 'set'
self.setPixmap(QtGui.QPixmap())
self.setCursor(self.wfc)
event.accept()
def mouseMoveEvent(self, event):
print event.pos()
event.accept()
def mouseReleaseEvent(self, event):
print 'rel'
self.setCursor(QtCore.Qt.ArrowCursor)
self.setPixmap(self.image)
event.accept()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
win = QtGui.QWidget()
lay = QtGui.QGridLayout(win)
dw = Drag(win)
lay.addWidget(dw)
lay.addItem(QtGui.QSpacerItem(13,20,QtGui.QSizePolicy.Expanding), 1, 1)
win.show()
win.resize(200,200)
app.exec_()
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